[Bug middle-end/111446] New: genmatch should warn/error out on recusive match patterns

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111446

            Bug ID: 111446
           Summary: genmatch should warn/error out on recusive match
                    patterns
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: internal-improvement
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: pinskia at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

After PR 111442 and PR 111435, I figure we should warn (or error out) about the
case where a match recusively uses itself as that will cause issues with VN and
almost always generate an infinite loop.